#include<iostream>
using namespace std;
int gcd(int x,int y)
{
	if(y==0) return x;
	else
	{
		return gcd(y,x%y);
	}
}
int main()
{
	int x=0,y=0,z=0;
	cin>>x>>y>>z;
	cout<<gcd(x,gcd(y,z))<<endl;
} 